SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1825995ca44e963f5a032408f36d1f7369ca18e7793fcfc46d45f19b177a9b0' 
  AND token = 'gDJdlqEiQ22KsSyYqIP5GBI0zPHRG+EBXSug2mSX6dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}